Latest Changes (and history)

2025

• 24. March 2025:
  Latest model of JPL Release 06.3 for 01/2025 is available.
• 14. March 2025:
  COST-G GRACE-FO RL02 combinations for 10/2024, 11/2024 and 12/2024 are available.
  COST-G fitted signal model for 12/2024 is now available.
• 28. February 2025:
  ITSG-Grace_op model for 12/2024 is availabe.
• 17. February 2025:
  Latest model of CSR Release 06.3 for 12/2024 is available.
  Latest model of JPL Release 06.3 for 12/2024 is available.
  Latest model of GFZ Release 06.3 for 12/2024 is available.
• 10. February 2025:
  Latest model of CSR Release 06.3 for 11/2024 is available.
  Latest model of JPL Release 06.3 for 11/2024 is available.
  Latest model of GFZ Release 06.3 for 11/2024 is available.
  ITSG-Grace_op model for 11/2024 is availabe.
  COST-G GRACE-FO RL02 combination for 09/2024 is available.
  COST-G fitted signal model for 09/2024 is now available.
  Tongji-Grace2022 updated to include models up to 08/2024 for the degrees 60, 96, 108 and 120.
• 10. January 2025:
  ITSG-Grace_op model for 10/2024 is availabe.
  HUST-Grace2024 models for 09/2024 is available.
  Topographic model EHFM_Earth_7200_plusGRS80 is available.
• 8. January 2025:
  AIUB GRACE-FO rl02 gravity field models for 2024-07 to 2024-10 are now available.
  CNES GRACE/GRACE-FO RL05 gravity field models for 2022-11 to 2024-08 are now available.
  A new time series of GRACE-FO monthly solutions SWJTU-GRACE-FO-RL01 from Southwest Jiaotong University is available.
• 7. January 2025:
  Latest model of CSR Release 06.3 for 10/2024 is available.
  Latest models of JPL Release 06.3 for 09/2024 and 10/2024 are available.
  Latest models of GFZ Release 06.3 for 09/2024 and 10/2024 are available.
  ITSG-Grace_op model for 09/2024 is availabe.

2024

• 6. December 2024:
  Latest model of CSR Release 06.3 for 09/2024 is available.
  Latest model of JPL Release 06.3 for 09/2024 is available.
• 25. November 2024:
  HUST-Grace2024 models from 03/2024 to 08/2024 are available.
  LUH-GRACE-FO-2020 models from 01/2024 to 07/2024 are available.
• 22. November 2024:
  COST-G GRACE-FO RL02 combinations for 08/2024 is available.
• 11. November 2024:
  Latest model of CSR Release 06.3 for 08/2024 is available.
  Latest model of JPL Release 06.3 for 08/2024 is available.
  Latest model of GFZ Release 06.3 for 08/2024 is available.
  COST-G GRACE-FO RL02 combinations for 07/2024 is available.
  ITSG-Grace_op model for 08/2024 is availabe.
• 28. October 2024:
  CSR Release 06.3 until 07/2024 is available.
  JPL Release 06.3 until 07/2024 is available.
  GFZ Release 06.3 until 07/2024 is available.
• 18. October 2024:
  COST-G GRACE-FO RL02 combinations for 06/2024 is available.
  COST-G fitted signal model for 06/2024 is now available.
  ITSG-Grace_op model for 07/2024 is availabe.
• 8. October 2024:
  AIUB GRACE-FO rl02 gravity field models for 2023-12 to 2024-06 are now available.
• 27. September 2024:
  ITSG-Grace_op model for 06/2024 is availabe.
• 6. September 2024:
  COST-G GRACE-FO RL02 combinations for 04/2024 and 05/2024 are available.
• 30. August 2024:
  Latest model of GFZ Release 06.1 for 05/2024 is available.
• 19. August 2024:
  Latest model of CSR Release 06.2 for 05/2024 is available.
  Latest model of JPL Release 06.1 for 05/2024 is available.
  ITSG-Grace_op model for 05/2024 is availabe.
  COST-G GRACE-FO RL02 combinations for 03/2024 are available.
  COST-G fitted signal model for 03/2024 is now available.
• 23. July 2024:
  New models of the SLR series IGG_UPWr_SLR from 10/2021 to 12/2023 are available.
• 22. July 2024:
  Latest models of CSR Release 06.2 for 03/2024 and 04/2024 are available.
  Latest models of GFZ Release 06.1 for 03/2024 and 04/2024 are available.
  Latest models of JPL Release 06.1 for 03/2024 and 04/2024 are available.
  ITSG-Grace_op model for 04/2024 is availabe.
• 28. June 2024:
  COST-G GRACE-FO RL02 combinations for 02/2024 are available.
  ITSG-Grace_op model for 03/2024 is availabe.
• 3. June 2024:
  ITSG-Grace_op model for 02/2024 is availabe.
• 31. May 2024:
  HUST-Grace2024 models from 01/2023 to 02/2024 are available.
• 21. May 2024:
  Latest Model of COST-G Grace-FO RL02 for 01/2024 is available.
• 13. May 2024:
  Latest models of GFZ Release 06.1 for 01/2024 and 02/2024 are available.
  Latest model of JPL Release 06.1 for 02/2024 is available.
• 23. April 2024:
  Latest models from JPL are available.
  CSR Release 06.2 available
• 11. April 2024:
  Latest models from GFZ and JPL are available.
  Latest COST-G GRACE-FO RL02 combinations are available.
  COST-G fitted signal model for 09/2023 is now available.
  Latest models from ITSG are available.
  Latest models for LUH-GRACE-FO-2020 are available.
• 20. March 2024:
  Migration of ICGEM to new Server.
  Improved Calculation results pages.
• 28. February 2024:
  Latest COST-G GRACE-FO RL02 combinations are available.
  Latest models from ITSG are available.
• 5. February 2024:
  Latest models from JPL and GFZ are available.
  Latest models from ITSG are available.
• 19. January 2024:
  Latest models from ITSG are available.
  The SLR models IGG_UPWr_SLR are available.
• 9. January 2024:
  Latest models from the 3 SDS processing centres are available.
  Latest COST-G GRACE-FO RL02 combinations are available.
  COST-G fitted signal model for 09/2023 is now available.
  Latest models from ITSG are available.

2023

• 1. December 2023:
  Simulated models MAGIC Level2a are available.
• 29. November 2023:
  Latest models from the 3 SDS processing centres are available.
• 7. November 2023:
  The Swarm gravity field models, with dates from 2023-04, 2023-05 and 2023-06, are available.
• 20. October 2023:
  Latest COST-G GRACE-FO RL02 combinations are available.
• 13. October 2023:
  Latest models from ITSG are available.
• 2. October 2023:
  Latest model from GFZ is available.
  
• 18. September 2023:
  COST-G fitted signal model for 03/2023 is now available.
• 1. September 2023:
  Latest models from ITSG are available.
• 29. August 2023:
  Latest COST-G GRACE-FO RL02 combinations are available.
  
• 8. August 2023:
  Latest models from the 3 SDS processing centres are available.
  Added new HLSST_SLR_COMB2023s model from Quantum Frontiers.
• 20. July 2023:
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.
  The Swarm gravity field models, with dates from 2023-01, 2023-02 and 2023-03, are available.
  Latest models for LUH-GRACE-FO-2020 are available.
  New Tongji Grace 2022 model series added.
• 21. June 2023:
  Latest COST-G GRACE-FO RL02 combinations are available.
  
• 16. June 2023:
  Latest models from CSR are available.
  
• 2. June 2023:
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.
• 23. May 2023:
  Release 6.1 from the 3 SDS CSR, GFZ and JPS have been added.
  The Swarm gravity field models, with dates from 2022-10, 2022-11 and 2022-12, are available.
• 28. April 2023:
  AIUB GRACE-FO gravity field models for 2022-09, 2022-10, 2022-11 and 2022-12 are now available.
• 17. March 2023:
  Latest models from the 3 SDS processing centres are available.
  COST-G GRACE-FO combination for 12/2022 is now available.
  COST-G fitted signal model for 12/2022 is now available.
• 24. February 2023:
  COST-G GRACE-FO combination RL02 was added.
  AIUB G3P monthly gravity field solutions added.
• 17. February 2023:
  New 2023 ICGEM-Format description is available,
• 10. February 2023:
  Latest models from the 3 SDS processing centres are available.
  COST-G GRACE-FO combination for 11/2022 is now available.
  Latest models from ITSG are available.
• 13. January 2023:
  COST-G GRACE-FO combination for 10/2022 is now available.
• 6. January 2023:
  The Swarm gravity field models, with dates from 2022-04 to 2022-09, are available.
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.

2022

• 24. November 2022:
  CNES GRACE/GRACE-FO RL05 series are now available.
  RL05 monthly gravity fields using truncated SVD inversion, RL05 10-day gravity fields using truncated SVD inversion
  and RL05 monthly gravity fields using standard unregularized Cholesky inversion are available on the Temporal Models page.
• 7. October 2022:
  The Swarm gravity field models, with dates 2022-01, 2022-02 and 2022-03, are available.
• 16. June 2022:
  AIUB GRACE-FO series for 09/2021, 10/2021, 11/2021, 12/2021, 01/2022, 02/2022, 03/2022 and 04/2022 are now available.
  Static model Tongji-GMMG2021S is available.
  Latest models from ITSG are available.
• 7. June 2022:
  COST-G GRACE-FO combination for 02/2022 and 03/2022 now available.
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.
• 19. April 2022:
  The most recent Swarm gravity field models, with dates 2021-10, 2021-11 and 2021-12, are available.
  COST-G GRACE-FO combination for 01/2022 is now available.
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.
• 11. March 2022:
  LUH GRACE-FO monthly operational series for 09/2021, 10/2021, 11/2021 and 12/2021 are now available.
• 4. March 2022:
  COST-G GRACE-FO combination for 12/2021 is now available.
  
• 22. February 2022:
  The most recent Swarm gravity field models, with dates 2021-07, 2021-08 and 2021-09, are available.
• 07. February 2022:
  COST-G GRACE-FO combination for 11/2021 is now available.
  
• 28. January 2022:
  AIUB GRACE-FO series for 09/2021, 10/2021 and 11/2021 are now available.
  
• 21. January 2022:
  COST-G GRACE-FO combination for 10/2021 is now available.
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.

2021

• 02. November 2021:
  LUH GRACE-FO monthly operational series for 06/2021, 07/2021 and 08/2021 are now available.
  COST-G GRACE-FO combination for 07/2021 and 08/2021 are now available.
  AIUB GRACE-FO series for 06/2021, 07/2021 and 08/2021 are now available.
  IGG-Swarm series from Institute of Geodesy and Geoinformation, University Bonn is available
• 27. September 2021:
  The most recent Swarm gravity field models, with dates 2021-04, 2021-05 and 2021-06, are available.
• 20. September 2021:
  COST-G GRACE-FO combination for 06/2021 is now available.
  The most recent Swarm GAX products are available.
• 27. August 2021:
  COST-G GRACE-FO combination for 05/2021 is now available.
  LUH GRACE-FO monthly operational series for 05/2021 is now available.
  AIUB GRACE-FO series for 03/2021, 04/2021 and 05/2021 are now available.
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.
• 12. July 2021:
  The most recent Swarm gravity field models, with dates 2021-01, 2021-02 and 2021-03, are available.
• 30. June 2021:
  LUH GRACE-FO monthly operational series for 04/2021 is now available.
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.
• 21. June 2021:
  COST-G GRACE-FO combination for 04/2021 is now available.
• 01. June 2021:
  Lunar gravity field models AIUB-GRL350A and AIUB-GRL350B are available under Gravity Field Models of other Celestial Bodies.
• 26. May 2021:
  COST-G GRACE-FO combination for 03/2021 is now available.
• 12. May 2021:
  LUH GRACE-FO monthly operational series for 03/2021 is now available.
  Latest models from the 3 SDS processing centres are available.
  Latest models from ITSG are available.
• 26. April 2021:
  COST-G GRACE-FO combination for 02/2021 is now available.
  IGG-SLR-HYBRID: High-resolution temporal gravity fields from satellite laser ranging developed at the Institute of Geodesy and Geoinformation, Bonn are available.
• 22. April 2021:
  LUH GRACE-FO monthly operational series for 02/2021 is now available.
• 15. April 2021:
  SGG-UGM-2 High resolution gravity field model up to degree 2190 combining GOCE data (GOSG01s), GRACE normal equations (ITSG-2018), EGM2008-derived gravity data over continents and altimetry-derived gravity data over oceans is available.
  AIUB GRACE-FO series for 01/2021 and 02/2021 are now available.
• 26. March 2021:
  LUH GRACE-FO monthly operational series for 01/2021 is now available.
  COST-G GRACE-FO combination for 01/2021 is now available.
• 22. March 2021:
  The most recent Swarm gravity field models, with dates 2020-10, 2020-11 and 2020-12, are available.
• 02. March 2021:
  COST-G GRACE-FO combination for 12/2020 is now available.
• 24. February 2021:
  LUH GRACE-FO monthly operational series for 12/2020 is now available.
  The GNSS/levelling data used in the evaluation have been updated for Australia, Brazil, and Canada. New GNSS/Levelling on benchmark points from Mexico are added in the evaluation of the global gravity field models.
• 18. February 2021:
  A density model of the lunar crust “densityMoon” (Sprlak et al. 2020) is now available in the Table of Models of Other Celestial Bodies.
• 16. February 2021:
  LUH GRACE-FO monthly operational series for 11/2020 is now available.
• 8. February 2021:
  AIUB GRACE-FO series for 11/2020 and 12/2020 are now available.
  COST-G GRACE-FO combination for 11/2020 is now available.
• 1. February 2021:
  The most recent Grace-FO gravity field models from CSR, GFZ and JPL are available.
  The most recent Grace-FO gravity field models from ITSG are available.
• 11. January 2021:
  Added the HUST-Grace2020 model series.
• 7. January 2021:
  The most recent Grace-FO gravity field models from COST-G are available. The most recent Grace-FO gravity field models from LUH are available.

2020

• 4. November 2020:
  The GRACE Follow-on gravity field models from COST-G are available.
• 6. October 2020:
  The most recent Swarm gravity field models, with dates 2020-04 2020-05 2020-06, are available.
  The most recent Grace-FO gravity field models from CSR, GFZ and JPL are available.
  The most recent Grace-FO gravity field models from ITSG are available.
• 18. September 2020:
  The GRACE Follow-On gravity field series from AIUB is available.
  The most recent Grace-FO gravity field models from CSR, GFZ and JPL are available.
• 14. July 2020:
  The most recent Swarm gravity field models, with dates 2020-01 2020-02 2020-03, are available.
  The most recent Grace-FO gravity field models from CSR, GFZ and JPL are available.
  The most recent Grace-FO gravity field models from ITSG are available.
• 30. April 2020:
  GAX products for the three Science Data System Centres are available for GRACE and GRACE-FO RL06 models.
• 24. April 2020:
  GAX products for the COST-G models are now available in ICGEM.
• 31. March 2020:
  The most recent Swarm gravity field models, with dates 2019-10 2019-11 2019-12, are available.

2019

• 15. December 2019:
  The ICGEM user subscription list is active. Please feel free to share your questions and answers in this platform. We will be updating you about the new features via this e-mail list.
• 11. November 2019:
  sphericalRFM_MOON_2519: Topographic gravity field model of the Moon based on the spherical approximation is available.
  sphericalRFM_CERES_2519: Topographic gravity field model of Ceres based on the spherical approximation is available.
  
• 30. October 2019:
  ROLI_SphN_3660 and ROLI_SphN_3660_plusGRS80: Earth's upper crust's (topographic) gravity field model developed based on Earth2014 is available from GFZ-Potsdam.
• 16. October 2019:
  LUH-Grace2018 monthly solutions: Solutions from 2010 to 2016 are added to the list of monthly LUH solutions.
• 26. September 2019:
  Swarm monthly solutions: Most recent monthly Swarm solutions, 2019-04 2019-05 2019-06, are added.
• 25. September 2019:
  XGM2019e_2159: XGM2019e combined global gravity field model from Technical University of Munich is available in three different expansions. The coefficietns are precalculated in the spheroidal harmonic domain and then converted into spherical harmonics and available as "XGM2019e" up to spherical harmonic d/o 5540, "XGM2019e_2159" to 2190, and "XGM2019" up to d/o 760. For different practical reasons, the user can refer to any of the three files. The calculation service results are based on XGM2019e_2159.
• 9. July 2019:
  GEO-Q_2019: New release of Time-variable gravity fields "QuantumFrontiers_HLSST_SLR_COMB2019s" from Leibniz Universität Hannover is available. See also here.
• 5. July 2019:
  GO_CONS_GCF_2_TIM_R6e: The polar extended gravity field model TIM_R6 is available. See also here.
• 26. June 2019:
  ITSG-Grace2018s: New release of GRACE only static global gravity field, ITSG-Grace2018s, from TU Graz is available. See also https://www.tugraz.at/institute/ifg/downloads/gravity-field-models/itsg-grace2018/ .
• 25. June 2019:
  Swarm monthly solutions: Monthly Swarm solutions are now available. More information can be found here here and here.
• 11. June 2019:
  CNES-GRGS Release 4 temporal model: New release of temporal global gravity field, CNES.RL04-v1.monthly.NEW_IERS2010_MEAN_POLE_CONVENTION, is available. See also https://grace.obs-mip.fr/variable-models-grace-lageos/grace-solutions-release-04/rl04-products-description/ .
• 7. June 2019:
  EIGEN-GRGS.RL04.MEAN-FIELD: New release of satellite-only mean global gravity field model from CNES-GRGS is available. See also https://grace.obs-mip.fr/variable-models-grace-lageos/mean-fields/release-04/ .
• 7. June 2019:
  GOCO06s: New release of combined satellite-only global gravity field model is now available. See also https://www.bgu.tum.de/iapg/forschung/schwerefeld/goco/ .
• 7. June 2019:
  New release GOCE satellite-only models
  
  • GO_CONS_GCF_2_DIR_R6: New release of GOCE satellite-only global gravity field model based on Direct solution is available. See also http://earth.esa.int/GOCE/ .,
    GO_CONS_GCF_2_TIM_R6: New release of GOCE satellite-only global gravity field model based on Time-wise solution is available. See also http://earth.esa.int/GOCE/ .
• 31. May 2019:
  STU_MoonTopo720_plusNormalField: New Moon topographic gravity field model with and without the normal potential of the Moon are now available See also http://edisk.cvt.stuba.sk/~xbuchab/ .
• 15. May 2019:
  New publication: Our new paper " ICGEM – 15 years of successful collection and distribution of global gravitational models, associated services, and future plans" is available at https://www.earth-syst-sci-data.net/11/647/2019/essd-11-647-2019.pdf.
• 10. May 2019:
  IGGT_R1C: Static global gravity field model with the contribution of polar terrestrial gravity data is available.
• 13. Febrauary 2019:
  Tongji-Grace2018_n96: New monthly series from Tongji University is available.

2018

• 11. December 2018:
  GFZ Release 06 New release of GFZ GRACE monthly solutions is available.
• 21. November 2018:
  ITSG-Grace2018 A new time series of monthly and daily GRACE global Earth models from TU Graz are available .
• 17. November 2018:
  SWJTU-GRACE-RL01 A new time series of GRACE monthly solutions SWJTU-GRACE-RL01 from Southwest Jiaotong University is available.
• 6. September 2018:
  LUH-GRACE2018 New time series of GRACE monthly solutions, LUH-GRACE2018 from Institude of Geodesy, University of Hannover is available.
• 1. July 2018:
  Tongji-Grace02k High-precision static GRACE-only global gravity field model derived by refined data processing strategies from Tongji University, China is available.
• 19. April 2018:
  SGG-UGM-1 Ultra high degree gravity field model SGG-UGM-1 derived combining EGM2008 gravity anomaly and GOCE observation data from Wuhan University, China is available.
• 19. April 2018:
  GOSG01S A GOCE-only gravity model GOSG01S from Wuhan University, China is available.
• 6. April 2018:
  geoQ_HLSST_SLR_COMB2018 Combined time variable gravity field models from Leibniz Universität Hannover is available.
• 16. February 2018:
  Topographic Gravity Field Models description is included under this Link.
• 14. February 2018:
  RFM_Moon_2520 Potential spherical harmonic model implied by topography (crust) of the Moon is available from University of Newcastle and Curtin University of Technology, Australia.
• 24. January 2018:
  IGG_RL01 Temporal gravity field model from the State Key Laboratory of Geodesy and Earth's Dynamics, the Institute of Geodesy and Geophysics (IGG), Chinese Academy of Sciences (CAS) is available.

2017

• 1. December 2017:
  IGGT_R1 developed by the scientists from Wuhan University and GFZ is available.
• 22. November 2017:
  IfE_GOCE05s from Institut für Erdmessung (IfE), Hannover is available.
• 28 August 2017:
  GO_CONS_GCF_2_SPW_R5 from Politecnico di Milano is available.
• 8 August 2017:
  Dv_MoonTopo_2180, new topographic model for Moon is included.
• 27 July 2017:
  GAO2012, Russian Global Model of the Earth's Gravitational Field is available.
• July 2017:
  Calculation service grid selection is renewed.
• 22 May 2017:
  XGM2016, the experimental gravity field model is available.
• May 2017:
  Frequently Asked Questions with answers are provided as a pdf document.
• May 2017:
  New ICGEM website was launched.
• 8. May 2017:
  NULP-02s is available.
• May 2017:
  Tongji-Grace02s is available

2016

• October 2016:
  New models ITU_GRACE16 and ITU_GGC16 included.
• 17. June 2016:
  New models ITU_GRACE16 and ITU_GGC16 included.
• 15. June 2016:
  New Monthly models from ITSG, TU Graz are available.
  New Daily models from ITSG, TU Graz are available.
• 11. May 2016:
  New model EIGEN-6S4 included.
• 10. May 2016:
  New model GOCO05c included.
• 9. May 2016:
  New lunar model GrazLGM300c included.
• 11. April 2016:
  Revised version of the monthly solutions Tongji-GRACE02 included.
• 9. February 2016:
  New model GGM05C included.

2015

• 7. December 2015:
  New model GECO and two models of the Earth's topographic gravitational potential RWI_TOPO_2015, REQ_TOPO_2015 included.
• 1. September 2015:
  Two new Moon models AIUB-GRL200A/B included.
• 23. July 2015:
  New monthly solutions Tongji-GRACE02 included.
• 9. June 2015:
  New model GGM05G included.
• 15. May 2015:
  Bugfix for the Visualizations Services: The computed grids for very small values of lmax (lmax ≤ 5) contained extremely large numbers. Unfortunately, this error could have quite drastic consequences for the user: Since the Java-server-thread did not finish rendering, the limitation of access numbers could inhibit further connections for this client.
• 27. April 2015:
  The "G³ Browser" has the new feature to display 3D-grid-plots for cross-sections (a line defined by two end-points). Example plots for the two major Earthquakes and polar regions have been added.
• 16. April 2015:
  For the Visualization Services now also the functional Water column can be displayed (for static fields and monthly models of the Earth).
• 31. March 2015:
  New model GOCO05s included.
• 27. March 2015:
  The last two pages that contained Java applets ("Visualization of Monthly Models", "Calculation Service for Celestial Bodies") have been replaced with JavaScript versions. Our ICGEM-service is from now completely free of Java Applets!
• 25. March 2015:
  The server-program for visualizations ("potato-server.C") now enables computations for higher orders (lmax > 360) by an improved routine for Legendre polynomials.
• 9. March 2015:
  The Visualization Services (Potato.html, Tutorial.html, PotatoBodies.html) are now implemented completely in JavaScript (no Java Applets) to avoid Oracle's restrictions. It should now work for all operating systems and browsers. The ICGEM-service is now nearly Java-free (on the client-side).
  Additionally, users have now the option to download generated images as files, and in the page "Table of Models" the visualization of gravity models is now possible with a simple mouse click on the button 'show' (analogous to 'calculate').
• 30. January 2015:
  The table of models on the page Evaluation of Models is now also interactively sortable, allowing a direct ranking of the models for different regions (and complete GPS/levelling data set).
• 26. January 2015:
  
  • The Calculation Service is now implemented completely in JavaScript (without Java Applets) to avoid the access restrictions introduced by Oracle.
    It should now work for all operating systems and browsers without trouble.
    Additionally, users have now the option to download generated images as PNG file.
  • The Table of Models is now sortable (for 'Model','Year', 'Degree', 'Data' and 'References').
    The buttons calculate in the last column of the table now offer a direct link to the Calculation Service for the selected model.
• 7. January 2015:
  New model GO_CONS_GCF_2_SPW_R4 included.

2014

• 2. December 2014:
  New model EIGEN-6C4 included.
• 28. November 2014:
  New Monthly models (Release 02) from AIUB are available.
  SLR-only monthly models from AIUB are available. New models ITSG-Grace2014s and ITSG-Grace2014k from ITSG, TU Graz are available.
  New Monthly models from ITSG, TU Graz are available.
  New Daily models from ITSG, TU Graz are available. Monthly models from CSR, JPL and GFZ has been updated.
• 7. November 2014:
  To circumvent Oracle's new security policy (since Java 1.8), which inhibits the usability of our Java applets, we provided a "java.policy" file, that users can install on their computer.
• 27. August 2014:
  Relaunch of the "G³ Browser": Now without Google Maps and completely written in Javascript.
• 30. July 2014:
  The "G³ [GFZ Grace Gravity] Browser" (preliminary title) is now available under the button Time varying gravity.
• 21. July 2014:
  New models GO_CONS_GCF_2_TIM_R5 and GO_CONS_GCF_2_DIR_R5 included.
• 17. July 2014:
  Monthly models from CSR, JPL and GFZ has been updated. GRACE solutions Release 03 of CNES/GRGS are available in the ICGEM-format.
• 15. July 2014:
  On the evaluation site comparisons with GPS/levelling data from Brazil are included.
• 15. July 2014:
  New models GOGRA04S and JYY_GOCE04S included.
• 3. April 2014:
  New models RWI_TOPO_2012, RWI_ISOS_2012, RWI_TOIS_2012 included.
• 3. April 2014:
  Now there is a new button: "Models related to Topography" on the left hand side and a separate table for gravity field models related to topography.
• 20. March 2014:
  New model EIGEN-6S2 included.
• 27. February 2014:
  New model dV_ELL_RET2012 (and dV_ELL_RET2012_plusGRS80) included.
• 29. January 2014:
  New model GGM05S included.
• 17. January 2014:
  New model EIGEN-6C3stat included.

2013

• 2. December 2013:
  New model Tongji-GRACE01 and the GRACE monthly solutions Tongji-GRACE01_2003_01 ... Tongji-GRACE01_2011_08 from the Tongji University, Shanghai, PR China, included.
• 11. November 2013:
  Migration of the ICGEM-server to a new PC, with 16 GB Ram (1,600 MHz) and Intel-Xeon(R) E5-1660 (6 core, 12 CPU, 3.3GHz, 15 MB cache).
  Comparisons with the old PC show an acceleration for the computing service of about 2- to 5-times faster, depending on the functional.
• 22. October 2013:
  The name of the model TUMGOCE02S has been changed into JYY_GOCE02S (at the request of the author).
• 20. September 2013:
  In the calculation service up to now the option "zero_degree_term = no" was ignored for the functionals:
  gravity_anomaly
  gravity_anomaly_cl
  gravity_disturbance
  ⇒ this has been corrected
  The new functional gravity_disturbance_geoid is now available ⇒ see the table on the calculation service site.
• 13. September 2013:
  New models GOGRA02S and TUMGOCE02S included.
• 2. August 2013:
  Two new models with degree and order 660 for the Moon (GRGM660PRIM, GL0660B), based on the GRAIL mission, have been included.
• 30. April 2013:
  New model ULux_CHAMP2013s and the CHAMP monthly solutions ULux2013s_2003_01 ... ULux2013s_2009_12 from the University of Luxembourg included.
• 24. April 2013:
  New model ITG-GOCE02 included.
• 15. April 2013:
  Visualization applet for monthly models (Animation) improved.
  Now also filtered solutions of all 3 processing centers (GFZ, JPL, CSR) and GFZ weekly solutions can be inspected.
• 28. March 2013:
  GRACE weekly solutions from GFZ included.
• 21. March 2013:
  New models GO_CONS_GCF_2_TIM_R4 and GO_CONS_GCF_2_DIR_R4 included.
• 11. February 2013:
  Revised Edition of the STR09/02 is available ⇒ Button "Theory".
• 11. January 2013:
  On the evaluation site comparisons with GPS/levelling data from Japan are included.

2012

• 11. December 2012:
  New model EIGEN-6C2 included.
• 21. September 2012:
  New model DGM-1S included.
• 14. July 2012:
  The value gmrefpot for the reference system EGM2008 was not correct.
  Due to accidentally erroneous rounding
  gmrefpot=3.986004415E+14 instead of gmrefpot=3.986004415d+14
  the (slightly wrong) value 3.98600446149d+14 m**3/s**2 was used.
  ⇒ error has been corrected
• 5. July 2012:
  New model GOCO03S included.
• 3. July 2012:
  The old models GFZ95A and GFZ97 are now available.
• 9. May 2012:
  Release 05 of monthly solutions of CSR are available.
  The release 05 monthly solutions are also available after non-isotropic smoothing (decorrelation). For this purpose the mean model EIGEN-6C has been subtracted and to the difference the 5 different filters DDK1, DDK2, DDK3, DDK4, and DDK5 after Kusche et al (2009) have been applied.
• 4. April 2012:
  First models of new release 05 of monthly solutions of JPL and GFZ are available.
• 2. March 2012:
  The Gravity Visualization Applet now includes the option to visualize the Earth's topography. (To show it, you may select the dropdown menu 'Geoid', or popup a new frame with the rightmost button 'Topo'.)
• 23. February 2012:
  New models for the topography:
  ETOPO2 has been replaced by ETOPO1 Ice Surface.
  The bi-linear interpolation as well as the spherical harmonic expansion of the topography is now on the basis of ETOPO1.
• 2. January 2012:
  The download for models has changed:
  All models larger than 200 Kbytes are now compressed to a "zip-archive" (name.zip).
  For some models (e.g. GOCE-models) so-called DataSheets are available and also packed into the downloadable archive.

2011

• 28. November 2011:
  In the calculation service the new keywords potential_ell, topography_shm and topography_grd has been introduced.
  The keyword topography_shm replaces the old topography.
  The meaning of the keywords are described in the table on the calculation service site.
• 12. November 2011:
  New models GO_CONS_GCF_2_TIM_R3, GO_CONS_GCF_2_DIR_R3 and GIF48 included.
• 13. September 2011:
  Release 02 of the GRGS 10-day solutions are now available.
  Notice from GRGS: "It is reminded to the users of the GRGS products that NO SMOOTHING OR FILTERING is necessary when using them, since they have already been stabilized during their generation process."
• 5. August 2011:
  The old model POEM-L1 is now available.
• 29. June 2011:
  New models GO_CONS_GCF_2_SPW_R1, EIGEN-6S and EIGEN-6C included.
  The ICGEM-format has been extended for sinusoidal time variable parameters (as used in the new EIGEN-models) ⇒ see new format description.
• 18. April 2011:
  New model GOCO02S included.
• 12. April 2011:
  New monthly solutions AIUB of the Astronomical Institute of the University of Bern included.
• 5. April 2011:
  The water density for functional "water_column" has been changed to 1000 [kg/m**3] (value for fresh water over land) whereas the water density for the simple Bouguer anomaly, functional "gravity_anomaly_bg", is 1025 [kg/m**3] (value for sea water at the surface) as before. The values are referenced in the header of the grid if used.
• 22. March 2011:
  New model AIUB-GRACE03S included.
• 21. February 2011:
  New GOCE models GO_CONS_GCF_2_TIM_R2 and GO_CONS_GCF_2_DIR_R2 from ESA included.
  To show the release, the models GO_CONS_GCF_2_SPW, GO_CONS_GCF_2_TIM and GO_CONS_GCF_2_DIR
  have been renamed to GO_CONS_GCF_2_SPW_R1, GO_CONS_GCF_2_TIM_R1 and GO_CONS_GCF_2_DIR_R1.

2010

• 12. November 2010:
  Some ICGEM-related documents are now available ⇒ see links on the first page
  
• 10. September 2010:
  The figures of the degree variances of the model GO_CONS_GCF_2_TIM were wrong.
  ⇒ error has been corrected
• 21. August 2010:
  New GOCE models GO_CONS_GCF_2_SPW, GO_CONS_GCF_2_TIM and GO_CONS_GCF_2_DIR from ESA included.
  Update of monthly solutions of CSR-, GFZ-, JPL-Release 04.
• 23. July 2010:
  New models EIGEN-51C, EIGEN-CHAMP05S and GOCO01S included.
• 19. May 2010:
  Models of Moon, Mars and Venus have been added to our service.
  It is not planned to offer the complete service of ICGEM also for non-Earth gravity field models, but we think it could be useful to compile also some gravity field models of other celestial bodies for downloading and for use in our visualisation and calculation service.
• 29. March 2010:
  New model AIUB-CHAMP03S included.
• 2. March 2010:
  New monthly solutions DMT-1 of the TU Delft included.
• 22. February 2010:
  New model ITG-Grace2010s and associated monthly solutions included.
• 18. February 2010:
  Update of monthly solutions of CSR-, GFZ-, JPL-Release 04.
• 16. February 2010:
  There was an error in the calculation of the Bouguer gravity anomaly:
  In the calculation of the topography from spherical harmonics for the thickness of the Bouguer plate the spherical latitude was used instead of the ellipsoidal. For the older spherical harmonic topography models this was correct and necessary because they were calculated in this way. The new DTM2006 refers (correctly) to ellipsoidal latitudes (like the potential models) but we did not adapt our software at this point - sorry :-( . (Unfortunately the tests for the Bouguer anomaly has been carried out only globally, i.e. ocean-continents, and regionally for equatorial areas → in both cases the latitude-effect is hardly visible)
  ⇒ the topography was wrongly shifted in latitude due to the difference between spherical and ellipsoidal latitude
  ⇒ affected were the Bouguer gravity anomaly (gravity_anomaly_bg) and the Geoid (due to the correction term added to height anomaly)
  ⇒ error has been corrected

2009

• 23. November 2009:
  Table with explanation of the functionals on the calculation service site has been changed (hopefully improved :-))
• 4. November 2009:
  New model AIUB-GRACE02S included.
• 7. October 2009: Update of monthly solutions of CSR-, GFZ-, JPL-Release 04.
  Note: the GFZ RL04 Level-2 gravity field for December 2008 (GSM-2_2008336-2009001_0029_EIGEN_G---_0004) has been updated as the product due to unknown reasons did not contain C21/S21 drift rates (see: GRACE SDS Newsletter).
• 1. October 2009:
  In the calculation of the new functional Bouguer gravity anomaly up to now only positive heights of the topography model has been considered
  → no reduction over sea.
  This has been changed: now in areas with negative heights a Bouguer plate with the density ρ_crust - ρ_water is considered.
  Warning. This results in erroneous reductions in land areas with negative heights (e.g. death sea or the Caspian sea region).
• 10 September 2009:
  Changes in the calculation service:
  New functional gravity_anomaly_bg for calculating the (simple) Bouguer gravity anomaly.
• 26 August 2009:
  Changes in the calculation service:
  The name of the functional gravity_ell was misleading so we introduce the new functional gravitation_ell.
  The meaning of the two functionals are:
  • gravity_ell: the magnitude of the gradient of the gravitational potential including the centrifugal potential
  • gravitation_ell: the magnitude of the gradient of the gravitational potential without the centrifugal potential
  Both functionals can be calculated on the ellipsoid or in space (use "height_over_ell").
• 24 August 2009:
  The maximum grid resolution for the visualization applet now can be set up to 0.2° (before 0.5°) making much more details visible.
  Usage tip: the most impressive details are visible for such high resolutions, when you use the "Anomaly" functional instead of "Geoid" for "egm2008" (perhaps with a reduced boost factor of 5000).
• 15 August 2009:
  The grids for the functionals
  • gravity_disturbance
  • gravity_anomaly
  • gravity_earth
  • height_anomaly
  now contain as additional information the column with the height above sea level (from bi-linear interpolation of the digital terrain model) of the point where the functional are calculated
• 7 August 2009:
  Installation of new server PC, 4xIntel(R) Xeon(R) @ 2.50GHz, approx. 10x faster than the old PC
• 30 June 2009:
  Changes in the calculation service:
  • Functional gravity replaced by gravity_earth (calculated on the Earth's surface containing the centrifugal acceleration as hitherto)
  • New Functional gravity_ell for calculating the magnitude of the gradient of the gravitational potential on the ellipsoid or in space (use "height_over_ell") without centrifugal potential
  • Two more digits in the grid output format
  • Display of the calculation progress for longer computations, every 10 sec. in the applet info line
• 20 May 2009:
  Order of entries in "Latest Changes" now latest on top
• 15. May 2009:
  In the Calculation Service it is now possible to calculate some functionals also at a defined height over the ellipsoid. This is possible for the following functionals:
  • gravity_anomaly_sa
  • gravity_disturbance_sa
  • height_anomaly_ell
  • second_r_derivative
  For this purpose the parameter "height_over_ell" has been introduced.
• 30. March 2009:
  A description of the theory and the formulas used by the calculation service is now available as Scientific Technical Report STR09/02
  (Button "Theory of the Calculation Service").
• 9. March 2009:
  The release-04 monthly solutions and the GRGS-10-day solutions are now also available after non-isotropic smoothing (decorrelation). For this purpose the mean model EIGEN-5C has been subtracted and to the difference the 3 different filters DDK1, DDK2, and DDK3 after Kusche et al (2009) have been applied. After filtering the mean model has been added back to ensure that they can be used in our calculation service to calculate the defined functionals.
• 27. February 2009:
  New model GGM03C included.

2008

• 28. November 2008:
  
  • Drift rates added to the models EIGEN-5C and EIGEN-5S
    (drift rates for C20, C21, S21, C30 and C40, which have to be taken into account in accordance with the GFZ Level-2 Processing Standards Release 4)
  • New Reference System EGM2008 added to the Calculation Service
    (the values for a and f are from the EGM2008-page and GM is from the model)
    The geometrical ellipsoid is 41cm smaller than the one of WGS84 and fits better the real (undisturbed) mean sea surface heights (mssh).
    The value U₀ for the normal potential on the ellipsoid (which results from the defining parameters GM, a, f, ω) ensures that the Geoid of EGM2008 with respect to this RefSys fits the (undisturbed) mssh without offset.
  • The value for the normal potential U₀ which results from the defining parameters of the reference system are included as information into the grid files produced by the Calculation Service
• 22. October 2008:
  Update of monthly solutions of CSR-, GFZ-, JPL-Release 04, and GRGS.
  
• 26. September 2008:
  The differences of the spectral comparisons now starts with degree 3.
  The reason is to avoid considering degree 2 differences due to different tide systems or different epochs for the degree 2 coefficients.
• 22. September 2008:
  New model GGM03S included.
• 12. September 2008:
  Evaluation of Models with new GPS/Levelling data for Europe (now 1234 instead of 186 points).
• 10. September 2008:
  New model AIUB-GRACE01S included.
• 3. September 2008:
  Changes in the calculation service:
  • Functional height_anomaly now for calculating the height anomalies on the Earth's surface
  • Functional height_anomaly_ell for calculating the height anomalies on the ellipsoid
  • Functional second_r_derivative for calculating the second derivative in radial direction of the disturbance potential
  • Possibility to consider (or not) the offset caused by different values for GM_Model and GM_RefSys, the so called "zero degree term"
  • Improved illuminated plots
• 04. July 2008:
  New models EIGEN-05S and EIGEN-05C included.
  
• 24. April 2008:
  New model EGM2008 included.
  Topography replaced by DTM2006 (spherical harmonics up to degree 2190) which comes together with EGM2008.
• 9. April 2008:
  The calculation of the functional "gravity" in the calculation service was wrong (wrong centrifugal acceleration).
  ==> error corrected
• 7. April 2008:
  Coefficients of models HARMOGRAV, GEM1 and GEM2 added for download.
  GPS / levelling comparisons of the models now in the mean-tide system (up to now it was tide-free).
• 28. January 2008:
  The gravity models WGS66 and WGS72 are now available, thanks to Paul Willmott.

2007

• 29. November 2007:
  Topography model ETOPO2 replaced by ETOPO2v2.
• 14. November 2007:
  New models ITG-Grace03 and AIUB-CHAMP01S included.
  New CNES/GRGS-monthly solutions included.
  New GFZ-monthly solutions included.
• 3. July 2007:
  New versions of monthly solutions by GFZ installed.
• 2. June 2007:
  The GPS/Levelling data (Button "Evaluation of the Models") are now compared with geoid heights instead of height anomalies.
• 4. May 2007:
  Helper-class replaced by java-swing ToolTips,
  'ServiceApplet' bugfix for 'user_defined' parameter sets, 'GuestBookApplet' improved.
  New version of shm2func installed.
• 16. Apr. 2007:
  Bunch of extensions
  
  • New program shm2func for calculation service: includes now Geoid and gravity anomalies without spherical approximation (topography considered)
  • Visualization of gravity anomaly possible
  • New visualization tool: animation of monthly models

2006

• 13. Nov. 2006:
  The Java applets now use the 'swing'-classes for buttons, choices, labels etc. This should result in better portability.
  Monthly models from 4 sources now available for computing service. Users must reload applets (Potato.jar) in all cases of changes!
• 1. Nov. 2006:
  ServiceApplet: The option "refsys = user_defined" now works as it should (was broken before).
• 1. Nov. 2006:
  Monthly solutions of CSR, GFZ, JPL and CNES/GRGS added under new button "Models from Dedicated Time Periods".
  Replaces "Monthly Solutions from GRACE".
• 26 Oct. 2006:
  Button "Latest Changes"

2004

• 24. Dec. 2004:
  The director of our ICGEM-service P. Schwintzer died unexpectedly at the age of 54.
• 18. May 2004:
  Announcement of the new computing service for geoid heights, gravity anomalies and gravity disturbances.

2003

• 19. Dec. 2003:
  Announcement of the new ICGEM-service as being one of the designated centres of the IGFS to the scientific community by Dr. Peter Schwintzer.
• December 2003:
  A dedicated server with hostname 'icgem.gfz-potsdam.de' is placed outside the GZF-firewall, to grant access to all users from the internet without restrictions.
• 24. Jan. 2003:
  The visualization service is online, implemented as Java applets, connecting to a TCP-server "potato-server.C", which sends generated (from the 'gfc'-files) grids.